Valmiki Ramayana Ayodhya Kanda Sarga 35 Shloka 16

यः whoever, आम्रम् mango tree, कुठारेण with an axe, छित्वा having severed, निम्बम् a nimba tree, परिचरेत्तु will grow, यश्च whoever, एनम् to this, पयसा with milk, सिञ्चेत् sprinkles, अस्य for him, मधुरः sweet,नैव भवेत् does not become.

By axing a mango tree and growing a nimba in its place and sprinkling it with milk one does not get sweet fruit.